Combustion heating installation



March 17, 1942. c. COLOMBI ET AL 3 9 COMBUSTION HEATING INSTALLATIONFiled June 6, 1959 3 Sheets-Sheet 1 I/ a, hz-3@ 7770 77 ey March 17,1942. I c. COLOMBI ETAL I COMBUSTION HEATING INSTALLATION 5streets-Sheet 2 Filed June` e, 1939 23776 4 3' C 60702775 z` 9 %wo/777@March 17, 1942. c. COLOMBI ETAL COMBUSTION HEATING INSTALLATION I .o- J

Patented Mar. 17, 1942 COMBUSTION HEATING INSTALLATION p Charles Colombiand Louis Monney, Lausanne, Switzerland, assignors to the firm BecomaticS. A., Genova, Switzerland, a firm of Switzerland Application June 6,1939, Serial .Na. 271328 of 'the damper is a function of thegastemperature'.

A further object is the provision of a looking device which is adaptedto keep the damper in closed position during the starting period of thecombustion in spite of an -intense draft, aslo'ng as `the gastemperature has not reached a predetermined value which can be var-iedby adjusting the device.

These and other 'objects will be apparent from the following descriptionand* claims,- reference being had to the accompanying `drawings wherem:i

'Figures 1 "and 2 are respectively -a schematic elevation and a planview, partly in sec'tionof 'a first embodiment of the presentinvention;`

Figure 3 is an elevation of a second embodiment and Figures 4 and 5 arerespective sections along lines4-4 and` 5-5 of Fig. 3.

Figure 6 is a plan view of a detail 'of thesecond embodiment.

The embodiment illustrated in Figures 1 and 2 comprises a chimney'flue lhaving a lateral aperture' 2 which communicates to 'the 'interior of acasing 3 having in one of its walls an 'aperture 4. A damper I oting in'I and 8 on the casing 3 s adapted to close this aperture 4. On thelower portion of the aXle 6 is secured a lever 9 having two arms lo andll. At thearm u a coil spring lZ is hooked in, the other end of which'is fixed to a screw [3 engaged in a nut M integral with the wall oi thecasing.

A-bimetal blade |5 extended within the flue l is secured on a bracketlBof the casing 3. The free end of this blade is hingedly connected witha rod ll which in turn by means of adeiormable member [8 is coupled witha second rod 19. This rod [9 which 's slidable in a 'bearing in thecasing while being guided between four pins 21 fixed on the casing,carres at-'its enda cross piece '22 which cooperates `with the arm llofthe l'evera.

5 mounted on an axle E piv- Switzerland June, 15, 193& 4 Claims.gomat-93? "The operation of "the represented installation isthefollowing:

The damper '5 submitted to the action of the spring l 2 constantly tendsto .close thevaperture 4. Assoon as a sufiic'ientdepression is createdby the draft' in 'the flue, the damper opens against 'the action of thespring z for giving passage to a certain quantityof air. This opening of.the damper, however, is limited by `the cross piece 22 whereagainstthelever arm ll will ab ut; The position 'of the cross piece 'depends onthe deformation of the bimetal .blade [5, in consequence -of thetemperature of? the gases passingthrough the flue. When the .gastemperature increases, the blade grows longer in the upward direction?of .Fig.` 1,.the cross piece 22 moves'ofl the end of. the leverarm H andpermits travel of this arm, and consequently an openingmotion .ofthe-damper 5, which is all the more. important .ias' the i gastemperature is more elevated. ;This travel limitation of the damperisviuse'fulcforthe case that'the depression in the fiuelissg'reat.and-.the temperature of thegases is` low, asit may happen during the,starting of a boiler for instance, so that the damper can'- n'ot openand thedraft .is maintained ata maximum :until the .combustion hasreached a desired stateythen the gases become :hot and 'the bladel'permitsthe opening of the damper 'for regulating ;the draft.

On th'e :other rsideif the depression in the flue reaches, onsaccourt of.atmospheric conditions, a valuemnearto zero and tends to become posi-'tive', the damper will be closed and will thus prevent any. flowing backof the gas into the room.

The 'valueofthe depression for which the damper begins to open can beregulated by the tension ?of ?the spring l2.

The spring' I'Z could bereplaced by a spiral spring, ;one 'end of whichwould be secured to theowall of theiscasing and ..the other end to theaxleof thedamper. A

certain embodimentswherein the opening section of the.aperturemust belarge, two dampers ;can be provided 'and symmetrically disposed withrespect to the rod 19 and each shutting .an aperture'of ;the casing. Thecross 'piece '22 provides in this case .two arms, each co-operatingwith. a lever mounted on the axle of each of 'the dampers .inamannerthat a 'single bimetal blade l-5 is :adapted .to limitwsimultaneously the opening of the' two idampers.

`Thefdevice for the travel limitation 'of .the damperis Iarranged 'in away to 'allow the theri mostatic :blade to 'freely bend 'under ;theiinfluthe interior' of the fiue 25 communicates; with the exteriorr side.A damper 33 is pivotally mountedin 34 and 35 on the frame tures 3 l.

which is closed. The gas temperature, therefore, must reach a highervalue before the plate 52 disengages the damper than if the bimetalblade 41 would have been straight at the start. Consequently, it ispossible by manipulating the regulating device to determine in advancethe degree of the combustion at which the installation must work, andwhich will be indicated on the gradup ated scale 6l by means of theindex 60.

If the flue 25 is of large dimensions, the rods 42 can beelongated byadjoining one or several rod istumpsiprovided with screw threads forbeing 29 for shutting the aper This damper constantly tends under" theeffect of its own weight to close the apertures The underframe 21provides atitslower' part V. an aperture 36, wherethrough passes asupport 31. u;

which is secured to the frame 29 by means of bolts 38. The portion 39 ofthis support'extends' towards the interior of the flue and'its end 40 isrectangularly bent up and shows two' holes 4l wherein two parallel,cylindrical metal rods .42 can slide. Each of theserods which extendhorizontally into the. flueand penetrate with their outer ends thesupport 31 through two holes 43,' is formed of two stumps provided withscrew threads for being screwed together. Furthermore the outer end ofthetwo rods 42 are secured together by means of a metal disc 44. Theother, inner ends of the rods42 are fixed in a metal platec 45 whereonis mounted a thermostat 46 constituted by three bimetal blades 41, 48and 49, whereby 'the two latterser've as stifiening blades. Therectangularly'bent end 50 of the blade 41 is perforated and a metal rodishooked therein. This rod 5! is threaded and screwed into a plate 52which is fixed toan elastic metal blade 53 mounted in 54 on the support31. The rod 5| is thus elastically guided for moving under the eflect ofthe deformation of the blade 41. The plate 52 co-operates with a nose 55integral with the damper 33 in a way that a traction of the rod 5| uponthe plate 52 determines the. closing of the damper. V u

The above mentioned 'disc 44 is provided with athreaded central borewhereth'ough is screwed a rod 56 disposed outside the flue and carryinga knurled button 51 at one end, while'the other end provides a neck 58wherein is engaged a tappet 59 secured to the 'support 31 and preventingthe rod 55 to be axially displaced. By turning the knurled button 51 thedisc 44 is moved along the rod 56. e

The disc 44 carries an index 60 registering with a. scale Bl. on a piece62 which is secured to the support 31. i i

At the starting of the heating installation the damper 33 is kept inclosed position under the effect of the cold blade 41 which exerts atraction upon the plate 52. As soon as the temperature of the gases hasreached a sufiicient value, the blade 41 bending towards the aperture 26disengages the nose 55 and permits the damper to open over a certainangle under theinfluence of the depression within the flue for admittingatmospheric air in order to reduce the draft. u

The initial position of the blade 41 can be varied by .the displacementof the rods 42 in their guidngholes 4l and 43, which is obtained byturning the knurled button 51. An anti-clockwise rotation of this buttondisplaces the rods' upwards in Fig. 4' and` the blade 41 bends becauseits end is keptstationary by means of 'the plate 52 bearing against thenose 55 of the 'damper 33:

scrwed together so that positioned in the blade 41 is always theneighbourhood of the center of the-flue.

The above described installations present the j advantage'of permittingthe regulation of the draft .in the flue while eliminating every riskthat the gasesfiow back into the rooms, which could happen 'by theexistence of overpressure in the flu' due to, a sudden change of theatmospheric conditions. .v r

1. Draught regulator for-combustion heating installation, in combinationwith a flue having a lateral aperture for admission of atmosp'heric air,of a damper mounted on thefiue to more 'or less open said aperture underthe influence of depressionexisting in the flue, a straight thermostaticblade disposed entirely within the flue to be-directly afiected by thetemperature of the hotfiue gases, a rod movable along its axis and beingmechanically connected at one of its extremities to the thermostaticblade, and a movable arresting member connected 'to the otherextremityof said rod for limiting the distance of travel of the damperin `function oi the flue gas temperature. 2. Draught regulator forcombustion` heating installation, in combinaton 'with a flue having alateral aperture for admission of atmospheric air,

of a damper mounted on the fiue to more or less open said aperture underthe influence of depressionexisting in the flue, a 'support displaceablymounted on the flue wall, a straight thermostatic blade disposedentirely within the flue to be directly afiected by the temperature ofthe hot flue gases said blade being secured to one end of saidsupportand extendingin a transverse direction with respect to thedirection of displacement of said support, a rod movable along its axisand being mechanically co'nne'cted'at one of itsextremities to thethermostatic blade, .a movable arresting member connected to the otherextremity'oi said rod for' limitingthe distance of travel of ;the damperin function of the flue'gas'temperature, and an Operatingorganoutsidethe flue and cooperatingwith the'other 'end of said supportfor displacing the same' on the flue wall with a View to modify at anytime the position of the thermostatic blade ,andj to regulate, 'in thisway, the acting temperatureof the flue' gases above which'the movablearresting member allows the damper to open'. i

3. Draught regulator for -combustion heating installation, -incombination with a flue having a lateral aperture for admission ofatmospheric air, of a damper `pivotally mounted on the flue to more orless open said aperture under'the influence of depression existingin'the flue; a 'support on the flue wall comprisir'g twop'arallel slidablerods extending through said wall into the flue, a plate secured to theadjacent inrier ends of? said rods and a disc fixed to.`and connectingthe :adjacent outer ends of said. rods a 'straight ther-t mostatic blademounted upon; the :plate of said support within the flue to extend in atransverse direction with respect to the direction of displacement ofsaid support while being entirely exposed to the temperature of the hotfiue gases, a rod movable along its axis and being mechanicallyconnected at one of its extremities to the thermostatic blade, a movablearrestng member connected to the other extremity of said rod forlimiting the distance of travel of the damper in function of the fiuegas temperature, and an Operating organ outside the fiue and cooperatngwith the disc of the support for sliding said support on the fiue wallwith a view to modify at any time the position of the thermostatic bladeand to regulate, in this way, the actng temperature of the flue gasesabove which the movable arresting member allows the damper to open.

4. Draught regul ator according to claim 3,

wherein said Operating organ includes a threaded stern rotatably mountedin the flue wall and provided with a manpulatng button, and wherein thedisc of said support is internally threaded to engage the externalthread of said stern so that by turning the manipulating button the disctravels along said stern and entrains said support.

CHARLES COLOMBI. LOUIS MONNEY.

